Solariella cf. segersi ( Poppe, Tagaro & Dekker, 2006 )

Helwerda, Renate Ariane, Wesselingh, Frank Pieter & Williams, Suzanne T., 2014, On some Vetigastropoda (Mollusca, Gastropoda) from the Plio-Pleistocene of the Philippines with descriptions of three new species, Zootaxa 3755 (2), pp. 101-135 : 125

Solariella cf. segersi ( Poppe, Tagaro & Dekker, 2006) nov. comb.

( Figures 56–57 )

cf. 2006 Minolia segersi nov. spec.—Poppe et al.: p. 132–133, pl. 72, figs 1–3. cf. 2009 Minolia segersi —Vilvens: p. 94, figs 93–100.

Material. Anda 5 (2).

Characterization. Shell conical, thick-walled, H 3.5 mm, W 3.1 mm; protoconch damaged or missing in studied material; sculpture of spiral and axial ribs with low knobs; deep sutural depression; base of body whorl with spiral ribs; umbilicus open, encircled by grooves and with axial and spiral chords.

Distribution. Apart from the studied material, Solariella segersi has been found in the Philippines between 100–224 m depth and has been reported from the East China Sea at 200 m depth ( Poppe et al. 2006) as well as from Eastern Indonesia from 186–291 m depth ( Vilvens 2009).

Remarks. The species has been assigned to Solariella on the basis of its moderately tall spire, turriculate outline, spiral sculpture, deep umbilicus and complete peristome, as well as genetic data ( Williams et al. 2013). The shells in the studied material do resemble Solariella segersi , but the vertical arrangement of the spiral ribs is slightly different: the lower spiral rib is situated slightly lower in the fossil material so that it becomes visible only on the body whorl.

Figures

FIGURES 56 – 58. Solariellidae. 56. Solariella cf. segersi (Poppe, Tagaro & Dekker, 2006). RGM 608.348. Locality Anda 5. (a) rear view, (b) apertural view, (c) basal view, (d) apical view. 57. Solariella cf. segersi (Poppe, Tagaro & Dekker, 2006). RGM 608.349. Locality Anda 5. (a) apertural view, (b) basal view, (c) apical view. 58. Spectamen spec. 1. RGM 608.350. Locality AndaDeVos. (a) rear view, (b) apertural view, (c) basal view, (d) apical view, (e) SEM, side view, (f) SEM, oblique view, scale bar in a – f 500 µm, (g) SEM detail of protoconch.